May weather forecast
Jackson, WY

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A calm and clear river and vast green fields approaching the iconic white mountains within the Grand Teton National Park in Jackson, Wyoming
A calm and clear river and vast green fields approaching the iconic white mountains within the Grand Teton National Park in Jackson, Wyoming

Weather in May

As May unfolds, Mother Nature switch flips, and Jackson gears up for summer. The city basks in more comfortable temperatures, and the snow covering the landscapes begins to retreat. However, remnants of the old snowfall, totalling 11.42" (290mm), carry the legacy of the past winter. Both daylight and sunshine become more generous outliers, fostering vivid hues of blooming flora. The thawing landscapes and gradually warming weather concoct the quintessential ambiance of late spring.

Temperature

Jackson's May weather brings a rise in high-temperatures, moving from an icy 37.8°F (3.2°C) in April to a cool 50.5°F (10.3°C). Jackson records a marked divergence from the day's high temperatures, with nights in May averaging at a freezing cold 28.8°F (-1.8°C).

Humidity

In Jackson, Wyoming, the average relative humidity in May is 75%.

Rainfall

In May, in Jackson, Wyoming, the rain falls for 15.4 days. Throughout May, 2.87" (73mm) of precipitation is accumulated. In Jackson, during the entire year, the rain falls for 103 days and collects up to 29.84" (758mm) of precipitation.

Snowfall

January through December are months with snowfall. In May, it is snowing for 15.7 days. Throughout May, 11.42" (290mm) of snow is accumulated. Throughout the year, in Jackson, there are 173.6 snowfall days, and 181.26" (4604mm) of snow is accumulated.

Daylight

In May, the average length of the day is 14h and 43min.
On the first day of May, sunrise is at 6:14 am and sunset at 8:25 pm. On the last day of the month, sunrise is at 5:44 am and sunset at 8:56 pm MDT.

Sunshine

The average sunshine in May is 9.5h.

UV index

In Jackson, Wyoming, the average daily maximum UV index in May is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A daily high UV index of 3 in May leads to these guidelines:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
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Frequently asked questions

What is the usual temperature for Jackson in May?

The high-temperature during May is 50.5°F (10.3°C) and the low-temperature is 28.8°F (-1.8°C).

What is the average humidity in May in Jackson?

In Jackson, the average relative humidity in May is 75%.

How much does it rain in Jackson in May?

In Jackson, in May, it is raining for 15.4 days, with typically 2.87" (73mm) of accumulated precipitation.

How much does it snow in Jackson in May?

In Jackson, in May, during 15.7 snowfall days, 11.42" (290mm) of snow is typically accumulated.

How many hours of daylight does Jackson have in May?

The average day length in May in Jackson is 14h and 43min.

When is the sunrise / sunset in May in Jackson?

In May, on the first day of the month, sunrise is at 6:14 am and sunset at 8:25 pm. On the last day of the month, in Jackson, Wyoming, sunrise is at 5:44 am and sunset at 8:56 pm MDT.

How many hours of sunshine does Jackson have in May?

In Jackson, Wyoming, the average sunshine duration in May is 9.5h.

What is the UV index reading in May in Jackson?

In May, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Jackson, WY

Average temperature in May - Jackson, WY
  • Average high temperature in May: 50.5°F

The warmest month (with the highest average high temperature) is July (73.4°F).
The month with the lowest average high temperature is December (21.9°F).

  • Average low temperature in May: 28.8°F

The month with the highest average low temperature is July (43.5°F).
The coldest month (with the lowest average low temperature) is January (4.8°F).

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Average pressure in May
Jackson, WY

Average pressure in May - Jackson, WY
  • Average pressure in May: 29.93"Hg

The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in May
Jackson, WY

Average wind speed in May - Jackson, WY
  • Average wind speed in May: 4.9mph

The windiest month (with the highest average wind speed) is June (5.7mph).
The calmest month (with the lowest average wind speed) is December (4.3mph).

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Average humidity in May
Jackson, WY

Average humidity in May - Jackson, WY
  • Average humidity in May: 75%

The month with the highest relative humidity is February (94%).
The month with the lowest relative humidity is August (50%).

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Average rainfall in May
Jackson, WY

Average rainfall in May - Jackson, WY
  • Average rainfall in May: 2.87"

The wettest month (with the highest rainfall) is February (3.54").
The driest month (with the least rainfall) is August (1.34").

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Average rainfall days in May
Jackson, WY

Average rainfall days in May - Jackson, WY
  • Average rainfall days in May: 15.4 days

The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (2.9 days).

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Average snowfall in May
Jackson, WY

Average snowfall in May - Jackson, WY
  • Average snowfall in May: 11.42"

The month with the highest snowfall is February (29.33").
The month with the least snowfall is August (0.12").

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Average snowfall days in May
Jackson, WY

Average snowfall days in May - Jackson, WY
  • Average snowfall days in May: 15.7 days

The month with the highest number of snowfall days is March (24.8 days).
The month with the least snowfall days is July (0.4 days).

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Average daylight in May /
Average sunshine in May
Jackson, WY

Average daylight in May / Average sunshine in May - Jackson, WY
  • Average daylight in May: 14h and 4min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in May: 9h and 3min

The month with the most sunshine is July (Average sunshine: 11h and 36min).
The month with the least sunshine is February (Average sunshine: 3h and 24min).

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Average sunshine days in May
Jackson, WY

Average sunshine days in May - Jackson, WY
  • Average sunshine days in May: 5.9 days

The month with the most sunshine days is July (15.6 days).
The month with the least sunshine days is April (3.8 days).

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Average UV index in May
Jackson, WY

Average UV index in May - Jackson, WY
  • Average UV index in May: 3

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).

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Average cloud cover in May
Jackson, WY

Average cloud cover in May - Jackson, WY
  • Average cloud cover in May: 38

The month with the most cloud cover is February (Cloud cover 72).
The months with the least cloud cover are July and August (Cloud cover 16).

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Average visibility in May
Jackson, WY

Average visibility in May - Jackson, WY
  • Average visibility in May: 5mi

The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March and December (3mi).

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Jackson, Wyoming, USA

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